Documentation/watchdog/src/watchdog-test.c

   1 /*
   2  * Watchdog Driver Test Program
   3  */
   4
   5 #include <stdio.h>
   6 #include <stdlib.h>
   7 #include <string.h>
   8 #include <unistd.h>
   9 #include <fcntl.h>
  10 #include <signal.h>
  11 #include <sys/ioctl.h>
  12 #include <linux/types.h>
  13 #include <linux/watchdog.h>
  14
  15 int fd;
  16
  17 /*
  18  * This function simply sends an IOCTL to the driver, which in turn ticks
  19  * the PC Watchdog card to reset its internal timer so it doesn't trigger
  20  * a computer reset.
  21  */
  22 static void keep_alive(void)
  23 {
  24     int dummy;
  25
  26     ioctl(fd, WDIOC_KEEPALIVE, &dummy);
  27 }
  28
  29 /*
  30  * The main program.  Run the program with "-d" to disable the card,
  31  * or "-e" to enable the card.
  32  */
  33
  34 static void term(int sig)
  35 {
  36     close(fd);
  37     fprintf(stderr, "Stopping watchdog ticks...\n");
  38     exit(0);
  39 }
  40
  41 int main(int argc, char *argv[])
  42 {
  43     int flags;
  44     unsigned int ping_rate = 1;
  45
  46     fd = open("/dev/watchdog", O_WRONLY);
  47
  48     if (fd == -1) {
  49         fprintf(stderr, "Watchdog device not enabled.\n");
  50         fflush(stderr);
  51         exit(-1);
  52     }
  53
  54     if (argc > 1) {
  55         if (!strncasecmp(argv[1], "-d", 2)) {
  56             flags = WDIOS_DISABLECARD;
  57             ioctl(fd, WDIOC_SETOPTIONS, &flags);
  58             fprintf(stderr, "Watchdog card disabled.\n");
  59             fflush(stderr);
  60             goto end;
  61         } else if (!strncasecmp(argv[1], "-e", 2)) {
  62             flags = WDIOS_ENABLECARD;
  63             ioctl(fd, WDIOC_SETOPTIONS, &flags);
  64             fprintf(stderr, "Watchdog card enabled.\n");
  65             fflush(stderr);
  66             goto end;
  67         } else if (!strncasecmp(argv[1], "-t", 2) && argv[2]) {
  68             flags = atoi(argv[2]);
  69             ioctl(fd, WDIOC_SETTIMEOUT, &flags);
  70             fprintf(stderr, "Watchdog timeout set to %u seconds.\n", flags);
  71             fflush(stderr);
  72             goto end;
  73         } else if (!strncasecmp(argv[1], "-p", 2) && argv[2]) {
  74             ping_rate = strtoul(argv[2], NULL, 0);
  75             fprintf(stderr, "Watchdog ping rate set to %u seconds.\n", ping_rate);
  76             fflush(stderr);
  77         } else {
  78             fprintf(stderr, "-d to disable, -e to enable, -t <n> to set " \
  79                 "the timeout,\n-p <n> to set the ping rate, and \n");
  80             fprintf(stderr, "run by itself to tick the card.\n");
  81             fflush(stderr);
  82             goto end;
  83         }
  84     }
  85
  86     fprintf(stderr, "Watchdog Ticking Away!\n");
  87     fflush(stderr);
  88
  89     signal(SIGINT, term);
  90
  91     while(1) {
  92         keep_alive();
  93         sleep(ping_rate);
  94     }
  95 end:
  96     close(fd);
  97     return 0;
  98 }